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security: add ioctl specific auditing to lsm_audit
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / wait.h
1 #ifndef _LINUX_WAIT_H
2 #define _LINUX_WAIT_H
3
4
5 #include <linux/list.h>
6 #include <linux/stddef.h>
7 #include <linux/spinlock.h>
8 #include <asm/current.h>
9 #include <uapi/linux/wait.h>
10
11 typedef struct __wait_queue wait_queue_t;
12 typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
13 int default_wake_function(wait_queue_t *wait, unsigned mode, int flags, void *key);
14
15 struct __wait_queue {
16 unsigned int flags;
17 #define WQ_FLAG_EXCLUSIVE 0x01
18 void *private;
19 wait_queue_func_t func;
20 struct list_head task_list;
21 };
22
23 struct wait_bit_key {
24 void *flags;
25 int bit_nr;
26 };
27
28 struct wait_bit_queue {
29 struct wait_bit_key key;
30 wait_queue_t wait;
31 };
32
33 struct __wait_queue_head {
34 spinlock_t lock;
35 struct list_head task_list;
36 };
37 typedef struct __wait_queue_head wait_queue_head_t;
38
39 struct task_struct;
40
41 /*
42 * Macros for declaration and initialisaton of the datatypes
43 */
44
45 #define __WAITQUEUE_INITIALIZER(name, tsk) { \
46 .private = tsk, \
47 .func = default_wake_function, \
48 .task_list = { NULL, NULL } }
49
50 #define DECLARE_WAITQUEUE(name, tsk) \
51 wait_queue_t name = __WAITQUEUE_INITIALIZER(name, tsk)
52
53 #define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \
54 .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
55 .task_list = { &(name).task_list, &(name).task_list } }
56
57 #define DECLARE_WAIT_QUEUE_HEAD(name) \
58 wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
59
60 #define __WAIT_BIT_KEY_INITIALIZER(word, bit) \
61 { .flags = word, .bit_nr = bit, }
62
63 extern void __init_waitqueue_head(wait_queue_head_t *q, const char *name, struct lock_class_key *);
64
65 #define init_waitqueue_head(q) \
66 do { \
67 static struct lock_class_key __key; \
68 \
69 __init_waitqueue_head((q), #q, &__key); \
70 } while (0)
71
72 #ifdef CONFIG_LOCKDEP
73 # define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \
74 ({ init_waitqueue_head(&name); name; })
75 # define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \
76 wait_queue_head_t name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name)
77 #else
78 # define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name)
79 #endif
80
81 static inline void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p)
82 {
83 q->flags = 0;
84 q->private = p;
85 q->func = default_wake_function;
86 }
87
88 static inline void init_waitqueue_func_entry(wait_queue_t *q,
89 wait_queue_func_t func)
90 {
91 q->flags = 0;
92 q->private = NULL;
93 q->func = func;
94 }
95
96 static inline int waitqueue_active(wait_queue_head_t *q)
97 {
98 return !list_empty(&q->task_list);
99 }
100
101 extern void add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);
102 extern void add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait);
103 extern void remove_wait_queue(wait_queue_head_t *q, wait_queue_t *wait);
104
105 static inline void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *new)
106 {
107 list_add(&new->task_list, &head->task_list);
108 }
109
110 /*
111 * Used for wake-one threads:
112 */
113 static inline void __add_wait_queue_exclusive(wait_queue_head_t *q,
114 wait_queue_t *wait)
115 {
116 wait->flags |= WQ_FLAG_EXCLUSIVE;
117 __add_wait_queue(q, wait);
118 }
119
120 static inline void __add_wait_queue_tail(wait_queue_head_t *head,
121 wait_queue_t *new)
122 {
123 list_add_tail(&new->task_list, &head->task_list);
124 }
125
126 static inline void __add_wait_queue_tail_exclusive(wait_queue_head_t *q,
127 wait_queue_t *wait)
128 {
129 wait->flags |= WQ_FLAG_EXCLUSIVE;
130 __add_wait_queue_tail(q, wait);
131 }
132
133 static inline void __remove_wait_queue(wait_queue_head_t *head,
134 wait_queue_t *old)
135 {
136 list_del(&old->task_list);
137 }
138
139 void __wake_up(wait_queue_head_t *q, unsigned int mode, int nr, void *key);
140 void __wake_up_locked_key(wait_queue_head_t *q, unsigned int mode, void *key);
141 void __wake_up_sync_key(wait_queue_head_t *q, unsigned int mode, int nr,
142 void *key);
143 void __wake_up_locked(wait_queue_head_t *q, unsigned int mode, int nr);
144 void __wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr);
145 void __wake_up_bit(wait_queue_head_t *, void *, int);
146 int __wait_on_bit(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
147 int __wait_on_bit_lock(wait_queue_head_t *, struct wait_bit_queue *, int (*)(void *), unsigned);
148 void wake_up_bit(void *, int);
149 int out_of_line_wait_on_bit(void *, int, int (*)(void *), unsigned);
150 int out_of_line_wait_on_bit_lock(void *, int, int (*)(void *), unsigned);
151 wait_queue_head_t *bit_waitqueue(void *, int);
152
153 #define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL)
154 #define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL)
155 #define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL)
156 #define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1)
157 #define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0)
158
159 #define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL)
160 #define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL)
161 #define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL)
162 #define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE, 1)
163
164 /*
165 * Wakeup macros to be used to report events to the targets.
166 */
167 #define wake_up_poll(x, m) \
168 __wake_up(x, TASK_NORMAL, 1, (void *) (m))
169 #define wake_up_locked_poll(x, m) \
170 __wake_up_locked_key((x), TASK_NORMAL, (void *) (m))
171 #define wake_up_interruptible_poll(x, m) \
172 __wake_up(x, TASK_INTERRUPTIBLE, 1, (void *) (m))
173 #define wake_up_interruptible_sync_poll(x, m) \
174 __wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, (void *) (m))
175
176 #define __wait_event(wq, condition) \
177 do { \
178 DEFINE_WAIT(__wait); \
179 \
180 for (;;) { \
181 prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
182 if (condition) \
183 break; \
184 schedule(); \
185 } \
186 finish_wait(&wq, &__wait); \
187 } while (0)
188
189 /**
190 * wait_event - sleep until a condition gets true
191 * @wq: the waitqueue to wait on
192 * @condition: a C expression for the event to wait for
193 *
194 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
195 * @condition evaluates to true. The @condition is checked each time
196 * the waitqueue @wq is woken up.
197 *
198 * wake_up() has to be called after changing any variable that could
199 * change the result of the wait condition.
200 */
201 #define wait_event(wq, condition) \
202 do { \
203 if (condition) \
204 break; \
205 __wait_event(wq, condition); \
206 } while (0)
207
208 #define __wait_event_timeout(wq, condition, ret) \
209 do { \
210 DEFINE_WAIT(__wait); \
211 \
212 for (;;) { \
213 prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
214 if (condition) \
215 break; \
216 ret = schedule_timeout(ret); \
217 if (!ret) \
218 break; \
219 } \
220 if (!ret && (condition)) \
221 ret = 1; \
222 finish_wait(&wq, &__wait); \
223 } while (0)
224
225 /**
226 * wait_event_timeout - sleep until a condition gets true or a timeout elapses
227 * @wq: the waitqueue to wait on
228 * @condition: a C expression for the event to wait for
229 * @timeout: timeout, in jiffies
230 *
231 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
232 * @condition evaluates to true. The @condition is checked each time
233 * the waitqueue @wq is woken up.
234 *
235 * wake_up() has to be called after changing any variable that could
236 * change the result of the wait condition.
237 *
238 * The function returns 0 if the @timeout elapsed, or the remaining
239 * jiffies (at least 1) if the @condition evaluated to %true before
240 * the @timeout elapsed.
241 */
242 #define wait_event_timeout(wq, condition, timeout) \
243 ({ \
244 long __ret = timeout; \
245 if (!(condition)) \
246 __wait_event_timeout(wq, condition, __ret); \
247 __ret; \
248 })
249
250 #define __wait_event_interruptible(wq, condition, ret) \
251 do { \
252 DEFINE_WAIT(__wait); \
253 \
254 for (;;) { \
255 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
256 if (condition) \
257 break; \
258 if (!signal_pending(current)) { \
259 schedule(); \
260 continue; \
261 } \
262 ret = -ERESTARTSYS; \
263 break; \
264 } \
265 finish_wait(&wq, &__wait); \
266 } while (0)
267
268 /**
269 * wait_event_interruptible - sleep until a condition gets true
270 * @wq: the waitqueue to wait on
271 * @condition: a C expression for the event to wait for
272 *
273 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
274 * @condition evaluates to true or a signal is received.
275 * The @condition is checked each time the waitqueue @wq is woken up.
276 *
277 * wake_up() has to be called after changing any variable that could
278 * change the result of the wait condition.
279 *
280 * The function will return -ERESTARTSYS if it was interrupted by a
281 * signal and 0 if @condition evaluated to true.
282 */
283 #define wait_event_interruptible(wq, condition) \
284 ({ \
285 int __ret = 0; \
286 if (!(condition)) \
287 __wait_event_interruptible(wq, condition, __ret); \
288 __ret; \
289 })
290
291 #define __wait_event_interruptible_timeout(wq, condition, ret) \
292 do { \
293 DEFINE_WAIT(__wait); \
294 \
295 for (;;) { \
296 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
297 if (condition) \
298 break; \
299 if (!signal_pending(current)) { \
300 ret = schedule_timeout(ret); \
301 if (!ret) \
302 break; \
303 continue; \
304 } \
305 ret = -ERESTARTSYS; \
306 break; \
307 } \
308 if (!ret && (condition)) \
309 ret = 1; \
310 finish_wait(&wq, &__wait); \
311 } while (0)
312
313 /**
314 * wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses
315 * @wq: the waitqueue to wait on
316 * @condition: a C expression for the event to wait for
317 * @timeout: timeout, in jiffies
318 *
319 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
320 * @condition evaluates to true or a signal is received.
321 * The @condition is checked each time the waitqueue @wq is woken up.
322 *
323 * wake_up() has to be called after changing any variable that could
324 * change the result of the wait condition.
325 *
326 * Returns:
327 * 0 if the @timeout elapsed, -%ERESTARTSYS if it was interrupted by
328 * a signal, or the remaining jiffies (at least 1) if the @condition
329 * evaluated to %true before the @timeout elapsed.
330 */
331 #define wait_event_interruptible_timeout(wq, condition, timeout) \
332 ({ \
333 long __ret = timeout; \
334 if (!(condition)) \
335 __wait_event_interruptible_timeout(wq, condition, __ret); \
336 __ret; \
337 })
338
339 #define __wait_event_hrtimeout(wq, condition, timeout, state) \
340 ({ \
341 int __ret = 0; \
342 DEFINE_WAIT(__wait); \
343 struct hrtimer_sleeper __t; \
344 \
345 hrtimer_init_on_stack(&__t.timer, CLOCK_MONOTONIC, \
346 HRTIMER_MODE_REL); \
347 hrtimer_init_sleeper(&__t, current); \
348 if ((timeout).tv64 != KTIME_MAX) \
349 hrtimer_start_range_ns(&__t.timer, timeout, \
350 current->timer_slack_ns, \
351 HRTIMER_MODE_REL); \
352 \
353 for (;;) { \
354 prepare_to_wait(&wq, &__wait, state); \
355 if (condition) \
356 break; \
357 if (state == TASK_INTERRUPTIBLE && \
358 signal_pending(current)) { \
359 __ret = -ERESTARTSYS; \
360 break; \
361 } \
362 if (!__t.task) { \
363 __ret = -ETIME; \
364 break; \
365 } \
366 schedule(); \
367 } \
368 \
369 hrtimer_cancel(&__t.timer); \
370 destroy_hrtimer_on_stack(&__t.timer); \
371 finish_wait(&wq, &__wait); \
372 __ret; \
373 })
374
375 /**
376 * wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses
377 * @wq: the waitqueue to wait on
378 * @condition: a C expression for the event to wait for
379 * @timeout: timeout, as a ktime_t
380 *
381 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
382 * @condition evaluates to true or a signal is received.
383 * The @condition is checked each time the waitqueue @wq is woken up.
384 *
385 * wake_up() has to be called after changing any variable that could
386 * change the result of the wait condition.
387 *
388 * The function returns 0 if @condition became true, or -ETIME if the timeout
389 * elapsed.
390 */
391 #define wait_event_hrtimeout(wq, condition, timeout) \
392 ({ \
393 int __ret = 0; \
394 if (!(condition)) \
395 __ret = __wait_event_hrtimeout(wq, condition, timeout, \
396 TASK_UNINTERRUPTIBLE); \
397 __ret; \
398 })
399
400 /**
401 * wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses
402 * @wq: the waitqueue to wait on
403 * @condition: a C expression for the event to wait for
404 * @timeout: timeout, as a ktime_t
405 *
406 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
407 * @condition evaluates to true or a signal is received.
408 * The @condition is checked each time the waitqueue @wq is woken up.
409 *
410 * wake_up() has to be called after changing any variable that could
411 * change the result of the wait condition.
412 *
413 * The function returns 0 if @condition became true, -ERESTARTSYS if it was
414 * interrupted by a signal, or -ETIME if the timeout elapsed.
415 */
416 #define wait_event_interruptible_hrtimeout(wq, condition, timeout) \
417 ({ \
418 long __ret = 0; \
419 if (!(condition)) \
420 __ret = __wait_event_hrtimeout(wq, condition, timeout, \
421 TASK_INTERRUPTIBLE); \
422 __ret; \
423 })
424
425 #define __wait_event_interruptible_exclusive(wq, condition, ret) \
426 do { \
427 DEFINE_WAIT(__wait); \
428 \
429 for (;;) { \
430 prepare_to_wait_exclusive(&wq, &__wait, \
431 TASK_INTERRUPTIBLE); \
432 if (condition) { \
433 finish_wait(&wq, &__wait); \
434 break; \
435 } \
436 if (!signal_pending(current)) { \
437 schedule(); \
438 continue; \
439 } \
440 ret = -ERESTARTSYS; \
441 abort_exclusive_wait(&wq, &__wait, \
442 TASK_INTERRUPTIBLE, NULL); \
443 break; \
444 } \
445 } while (0)
446
447 #define wait_event_interruptible_exclusive(wq, condition) \
448 ({ \
449 int __ret = 0; \
450 if (!(condition)) \
451 __wait_event_interruptible_exclusive(wq, condition, __ret);\
452 __ret; \
453 })
454
455
456 #define __wait_event_interruptible_locked(wq, condition, exclusive, irq) \
457 ({ \
458 int __ret = 0; \
459 DEFINE_WAIT(__wait); \
460 if (exclusive) \
461 __wait.flags |= WQ_FLAG_EXCLUSIVE; \
462 do { \
463 if (likely(list_empty(&__wait.task_list))) \
464 __add_wait_queue_tail(&(wq), &__wait); \
465 set_current_state(TASK_INTERRUPTIBLE); \
466 if (signal_pending(current)) { \
467 __ret = -ERESTARTSYS; \
468 break; \
469 } \
470 if (irq) \
471 spin_unlock_irq(&(wq).lock); \
472 else \
473 spin_unlock(&(wq).lock); \
474 schedule(); \
475 if (irq) \
476 spin_lock_irq(&(wq).lock); \
477 else \
478 spin_lock(&(wq).lock); \
479 } while (!(condition)); \
480 __remove_wait_queue(&(wq), &__wait); \
481 __set_current_state(TASK_RUNNING); \
482 __ret; \
483 })
484
485
486 /**
487 * wait_event_interruptible_locked - sleep until a condition gets true
488 * @wq: the waitqueue to wait on
489 * @condition: a C expression for the event to wait for
490 *
491 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
492 * @condition evaluates to true or a signal is received.
493 * The @condition is checked each time the waitqueue @wq is woken up.
494 *
495 * It must be called with wq.lock being held. This spinlock is
496 * unlocked while sleeping but @condition testing is done while lock
497 * is held and when this macro exits the lock is held.
498 *
499 * The lock is locked/unlocked using spin_lock()/spin_unlock()
500 * functions which must match the way they are locked/unlocked outside
501 * of this macro.
502 *
503 * wake_up_locked() has to be called after changing any variable that could
504 * change the result of the wait condition.
505 *
506 * The function will return -ERESTARTSYS if it was interrupted by a
507 * signal and 0 if @condition evaluated to true.
508 */
509 #define wait_event_interruptible_locked(wq, condition) \
510 ((condition) \
511 ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 0))
512
513 /**
514 * wait_event_interruptible_locked_irq - sleep until a condition gets true
515 * @wq: the waitqueue to wait on
516 * @condition: a C expression for the event to wait for
517 *
518 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
519 * @condition evaluates to true or a signal is received.
520 * The @condition is checked each time the waitqueue @wq is woken up.
521 *
522 * It must be called with wq.lock being held. This spinlock is
523 * unlocked while sleeping but @condition testing is done while lock
524 * is held and when this macro exits the lock is held.
525 *
526 * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq()
527 * functions which must match the way they are locked/unlocked outside
528 * of this macro.
529 *
530 * wake_up_locked() has to be called after changing any variable that could
531 * change the result of the wait condition.
532 *
533 * The function will return -ERESTARTSYS if it was interrupted by a
534 * signal and 0 if @condition evaluated to true.
535 */
536 #define wait_event_interruptible_locked_irq(wq, condition) \
537 ((condition) \
538 ? 0 : __wait_event_interruptible_locked(wq, condition, 0, 1))
539
540 /**
541 * wait_event_interruptible_exclusive_locked - sleep exclusively until a condition gets true
542 * @wq: the waitqueue to wait on
543 * @condition: a C expression for the event to wait for
544 *
545 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
546 * @condition evaluates to true or a signal is received.
547 * The @condition is checked each time the waitqueue @wq is woken up.
548 *
549 * It must be called with wq.lock being held. This spinlock is
550 * unlocked while sleeping but @condition testing is done while lock
551 * is held and when this macro exits the lock is held.
552 *
553 * The lock is locked/unlocked using spin_lock()/spin_unlock()
554 * functions which must match the way they are locked/unlocked outside
555 * of this macro.
556 *
557 * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
558 * set thus when other process waits process on the list if this
559 * process is awaken further processes are not considered.
560 *
561 * wake_up_locked() has to be called after changing any variable that could
562 * change the result of the wait condition.
563 *
564 * The function will return -ERESTARTSYS if it was interrupted by a
565 * signal and 0 if @condition evaluated to true.
566 */
567 #define wait_event_interruptible_exclusive_locked(wq, condition) \
568 ((condition) \
569 ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 0))
570
571 /**
572 * wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true
573 * @wq: the waitqueue to wait on
574 * @condition: a C expression for the event to wait for
575 *
576 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
577 * @condition evaluates to true or a signal is received.
578 * The @condition is checked each time the waitqueue @wq is woken up.
579 *
580 * It must be called with wq.lock being held. This spinlock is
581 * unlocked while sleeping but @condition testing is done while lock
582 * is held and when this macro exits the lock is held.
583 *
584 * The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq()
585 * functions which must match the way they are locked/unlocked outside
586 * of this macro.
587 *
588 * The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag
589 * set thus when other process waits process on the list if this
590 * process is awaken further processes are not considered.
591 *
592 * wake_up_locked() has to be called after changing any variable that could
593 * change the result of the wait condition.
594 *
595 * The function will return -ERESTARTSYS if it was interrupted by a
596 * signal and 0 if @condition evaluated to true.
597 */
598 #define wait_event_interruptible_exclusive_locked_irq(wq, condition) \
599 ((condition) \
600 ? 0 : __wait_event_interruptible_locked(wq, condition, 1, 1))
601
602
603
604 #define __wait_event_killable(wq, condition, ret) \
605 do { \
606 DEFINE_WAIT(__wait); \
607 \
608 for (;;) { \
609 prepare_to_wait(&wq, &__wait, TASK_KILLABLE); \
610 if (condition) \
611 break; \
612 if (!fatal_signal_pending(current)) { \
613 schedule(); \
614 continue; \
615 } \
616 ret = -ERESTARTSYS; \
617 break; \
618 } \
619 finish_wait(&wq, &__wait); \
620 } while (0)
621
622 /**
623 * wait_event_killable - sleep until a condition gets true
624 * @wq: the waitqueue to wait on
625 * @condition: a C expression for the event to wait for
626 *
627 * The process is put to sleep (TASK_KILLABLE) until the
628 * @condition evaluates to true or a signal is received.
629 * The @condition is checked each time the waitqueue @wq is woken up.
630 *
631 * wake_up() has to be called after changing any variable that could
632 * change the result of the wait condition.
633 *
634 * The function will return -ERESTARTSYS if it was interrupted by a
635 * signal and 0 if @condition evaluated to true.
636 */
637 #define wait_event_killable(wq, condition) \
638 ({ \
639 int __ret = 0; \
640 if (!(condition)) \
641 __wait_event_killable(wq, condition, __ret); \
642 __ret; \
643 })
644
645
646 #define __wait_event_lock_irq(wq, condition, lock, cmd) \
647 do { \
648 DEFINE_WAIT(__wait); \
649 \
650 for (;;) { \
651 prepare_to_wait(&wq, &__wait, TASK_UNINTERRUPTIBLE); \
652 if (condition) \
653 break; \
654 spin_unlock_irq(&lock); \
655 cmd; \
656 schedule(); \
657 spin_lock_irq(&lock); \
658 } \
659 finish_wait(&wq, &__wait); \
660 } while (0)
661
662 /**
663 * wait_event_lock_irq_cmd - sleep until a condition gets true. The
664 * condition is checked under the lock. This
665 * is expected to be called with the lock
666 * taken.
667 * @wq: the waitqueue to wait on
668 * @condition: a C expression for the event to wait for
669 * @lock: a locked spinlock_t, which will be released before cmd
670 * and schedule() and reacquired afterwards.
671 * @cmd: a command which is invoked outside the critical section before
672 * sleep
673 *
674 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
675 * @condition evaluates to true. The @condition is checked each time
676 * the waitqueue @wq is woken up.
677 *
678 * wake_up() has to be called after changing any variable that could
679 * change the result of the wait condition.
680 *
681 * This is supposed to be called while holding the lock. The lock is
682 * dropped before invoking the cmd and going to sleep and is reacquired
683 * afterwards.
684 */
685 #define wait_event_lock_irq_cmd(wq, condition, lock, cmd) \
686 do { \
687 if (condition) \
688 break; \
689 __wait_event_lock_irq(wq, condition, lock, cmd); \
690 } while (0)
691
692 /**
693 * wait_event_lock_irq - sleep until a condition gets true. The
694 * condition is checked under the lock. This
695 * is expected to be called with the lock
696 * taken.
697 * @wq: the waitqueue to wait on
698 * @condition: a C expression for the event to wait for
699 * @lock: a locked spinlock_t, which will be released before schedule()
700 * and reacquired afterwards.
701 *
702 * The process is put to sleep (TASK_UNINTERRUPTIBLE) until the
703 * @condition evaluates to true. The @condition is checked each time
704 * the waitqueue @wq is woken up.
705 *
706 * wake_up() has to be called after changing any variable that could
707 * change the result of the wait condition.
708 *
709 * This is supposed to be called while holding the lock. The lock is
710 * dropped before going to sleep and is reacquired afterwards.
711 */
712 #define wait_event_lock_irq(wq, condition, lock) \
713 do { \
714 if (condition) \
715 break; \
716 __wait_event_lock_irq(wq, condition, lock, ); \
717 } while (0)
718
719
720 #define __wait_event_interruptible_lock_irq(wq, condition, \
721 lock, ret, cmd) \
722 do { \
723 DEFINE_WAIT(__wait); \
724 \
725 for (;;) { \
726 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
727 if (condition) \
728 break; \
729 if (signal_pending(current)) { \
730 ret = -ERESTARTSYS; \
731 break; \
732 } \
733 spin_unlock_irq(&lock); \
734 cmd; \
735 schedule(); \
736 spin_lock_irq(&lock); \
737 } \
738 finish_wait(&wq, &__wait); \
739 } while (0)
740
741 /**
742 * wait_event_interruptible_lock_irq_cmd - sleep until a condition gets true.
743 * The condition is checked under the lock. This is expected to
744 * be called with the lock taken.
745 * @wq: the waitqueue to wait on
746 * @condition: a C expression for the event to wait for
747 * @lock: a locked spinlock_t, which will be released before cmd and
748 * schedule() and reacquired afterwards.
749 * @cmd: a command which is invoked outside the critical section before
750 * sleep
751 *
752 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
753 * @condition evaluates to true or a signal is received. The @condition is
754 * checked each time the waitqueue @wq is woken up.
755 *
756 * wake_up() has to be called after changing any variable that could
757 * change the result of the wait condition.
758 *
759 * This is supposed to be called while holding the lock. The lock is
760 * dropped before invoking the cmd and going to sleep and is reacquired
761 * afterwards.
762 *
763 * The macro will return -ERESTARTSYS if it was interrupted by a signal
764 * and 0 if @condition evaluated to true.
765 */
766 #define wait_event_interruptible_lock_irq_cmd(wq, condition, lock, cmd) \
767 ({ \
768 int __ret = 0; \
769 \
770 if (!(condition)) \
771 __wait_event_interruptible_lock_irq(wq, condition, \
772 lock, __ret, cmd); \
773 __ret; \
774 })
775
776 /**
777 * wait_event_interruptible_lock_irq - sleep until a condition gets true.
778 * The condition is checked under the lock. This is expected
779 * to be called with the lock taken.
780 * @wq: the waitqueue to wait on
781 * @condition: a C expression for the event to wait for
782 * @lock: a locked spinlock_t, which will be released before schedule()
783 * and reacquired afterwards.
784 *
785 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
786 * @condition evaluates to true or signal is received. The @condition is
787 * checked each time the waitqueue @wq is woken up.
788 *
789 * wake_up() has to be called after changing any variable that could
790 * change the result of the wait condition.
791 *
792 * This is supposed to be called while holding the lock. The lock is
793 * dropped before going to sleep and is reacquired afterwards.
794 *
795 * The macro will return -ERESTARTSYS if it was interrupted by a signal
796 * and 0 if @condition evaluated to true.
797 */
798 #define wait_event_interruptible_lock_irq(wq, condition, lock) \
799 ({ \
800 int __ret = 0; \
801 \
802 if (!(condition)) \
803 __wait_event_interruptible_lock_irq(wq, condition, \
804 lock, __ret, ); \
805 __ret; \
806 })
807
808 #define __wait_event_interruptible_lock_irq_timeout(wq, condition, \
809 lock, ret) \
810 do { \
811 DEFINE_WAIT(__wait); \
812 \
813 for (;;) { \
814 prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
815 if (condition) \
816 break; \
817 if (signal_pending(current)) { \
818 ret = -ERESTARTSYS; \
819 break; \
820 } \
821 spin_unlock_irq(&lock); \
822 ret = schedule_timeout(ret); \
823 spin_lock_irq(&lock); \
824 if (!ret) \
825 break; \
826 } \
827 finish_wait(&wq, &__wait); \
828 } while (0)
829
830 /**
831 * wait_event_interruptible_lock_irq_timeout - sleep until a condition gets true or a timeout elapses.
832 * The condition is checked under the lock. This is expected
833 * to be called with the lock taken.
834 * @wq: the waitqueue to wait on
835 * @condition: a C expression for the event to wait for
836 * @lock: a locked spinlock_t, which will be released before schedule()
837 * and reacquired afterwards.
838 * @timeout: timeout, in jiffies
839 *
840 * The process is put to sleep (TASK_INTERRUPTIBLE) until the
841 * @condition evaluates to true or signal is received. The @condition is
842 * checked each time the waitqueue @wq is woken up.
843 *
844 * wake_up() has to be called after changing any variable that could
845 * change the result of the wait condition.
846 *
847 * This is supposed to be called while holding the lock. The lock is
848 * dropped before going to sleep and is reacquired afterwards.
849 *
850 * The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it
851 * was interrupted by a signal, and the remaining jiffies otherwise
852 * if the condition evaluated to true before the timeout elapsed.
853 */
854 #define wait_event_interruptible_lock_irq_timeout(wq, condition, lock, \
855 timeout) \
856 ({ \
857 int __ret = timeout; \
858 \
859 if (!(condition)) \
860 __wait_event_interruptible_lock_irq_timeout( \
861 wq, condition, lock, __ret); \
862 __ret; \
863 })
864
865
866 /*
867 * These are the old interfaces to sleep waiting for an event.
868 * They are racy. DO NOT use them, use the wait_event* interfaces above.
869 * We plan to remove these interfaces.
870 */
871 extern void sleep_on(wait_queue_head_t *q);
872 extern long sleep_on_timeout(wait_queue_head_t *q,
873 signed long timeout);
874 extern void interruptible_sleep_on(wait_queue_head_t *q);
875 extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
876 signed long timeout);
877
878 /*
879 * Waitqueues which are removed from the waitqueue_head at wakeup time
880 */
881 void prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state);
882 void prepare_to_wait_exclusive(wait_queue_head_t *q, wait_queue_t *wait, int state);
883 void finish_wait(wait_queue_head_t *q, wait_queue_t *wait);
884 void abort_exclusive_wait(wait_queue_head_t *q, wait_queue_t *wait,
885 unsigned int mode, void *key);
886 int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
887 int wake_bit_function(wait_queue_t *wait, unsigned mode, int sync, void *key);
888
889 #define DEFINE_WAIT_FUNC(name, function) \
890 wait_queue_t name = { \
891 .private = current, \
892 .func = function, \
893 .task_list = LIST_HEAD_INIT((name).task_list), \
894 }
895
896 #define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function)
897
898 #define DEFINE_WAIT_BIT(name, word, bit) \
899 struct wait_bit_queue name = { \
900 .key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
901 .wait = { \
902 .private = current, \
903 .func = wake_bit_function, \
904 .task_list = \
905 LIST_HEAD_INIT((name).wait.task_list), \
906 }, \
907 }
908
909 #define init_wait(wait) \
910 do { \
911 (wait)->private = current; \
912 (wait)->func = autoremove_wake_function; \
913 INIT_LIST_HEAD(&(wait)->task_list); \
914 (wait)->flags = 0; \
915 } while (0)
916
917 /**
918 * wait_on_bit - wait for a bit to be cleared
919 * @word: the word being waited on, a kernel virtual address
920 * @bit: the bit of the word being waited on
921 * @action: the function used to sleep, which may take special actions
922 * @mode: the task state to sleep in
923 *
924 * There is a standard hashed waitqueue table for generic use. This
925 * is the part of the hashtable's accessor API that waits on a bit.
926 * For instance, if one were to have waiters on a bitflag, one would
927 * call wait_on_bit() in threads waiting for the bit to clear.
928 * One uses wait_on_bit() where one is waiting for the bit to clear,
929 * but has no intention of setting it.
930 */
931 static inline int wait_on_bit(void *word, int bit,
932 int (*action)(void *), unsigned mode)
933 {
934 if (!test_bit(bit, word))
935 return 0;
936 return out_of_line_wait_on_bit(word, bit, action, mode);
937 }
938
939 /**
940 * wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
941 * @word: the word being waited on, a kernel virtual address
942 * @bit: the bit of the word being waited on
943 * @action: the function used to sleep, which may take special actions
944 * @mode: the task state to sleep in
945 *
946 * There is a standard hashed waitqueue table for generic use. This
947 * is the part of the hashtable's accessor API that waits on a bit
948 * when one intends to set it, for instance, trying to lock bitflags.
949 * For instance, if one were to have waiters trying to set bitflag
950 * and waiting for it to clear before setting it, one would call
951 * wait_on_bit() in threads waiting to be able to set the bit.
952 * One uses wait_on_bit_lock() where one is waiting for the bit to
953 * clear with the intention of setting it, and when done, clearing it.
954 */
955 static inline int wait_on_bit_lock(void *word, int bit,
956 int (*action)(void *), unsigned mode)
957 {
958 if (!test_and_set_bit(bit, word))
959 return 0;
960 return out_of_line_wait_on_bit_lock(word, bit, action, mode);
961 }
962
963 #endif
kernel source for telekom puls (alcatel/mediatek)